To reduce costs, Ford began installing more of Shelby's unique components directly at the San Jose assembly line before the cars were shipped to LA for final finishing. For example, the 428 big-block engines for the GT500 and the special exhaust systems were built-in. However, the remaining interior, fiberglass, and specific trim components were still finished by hand at the Shelby Facility.
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This is a different process used in 1967 versus 1969 when Shelby Automotive contracted with AO Smith to do the mods.